本研究使用高壓震盪管密度儀分別測量含離子液體的溶液在溫度介於298.15 K-348.15 K，壓力高達50 MPa的密度數據，本研究使用了 [DIPEA][C2COO]、[DIPEA][C7COO]兩種不同離子液體與兩種寡聚物PEG200、PPG425和water所組成五組雙成分系統。實驗所量取的密度數據，均可用Tait模式和半經驗模式準確關聯。
由實驗所得之密度數據，計算出不同條件下之過剩體積。[DIPEA][C2COO] + water、[DIPEA][C2COO] + PEG200、[DIPEA][C7COO] + PPG425的系統過剩體積與組成之關係圖呈現S形狀。[DIPEA][C7COO] + PEG200在整個組成範圍之過剩體積皆為負值。[DIPEA][C2COO] + PPG425在所有組成範圍的過剩體積為正值。這些混合物在定溫及定壓條件下之過剩體積與組成之關係可用modified Redlich-Kister模式表示。
實驗所量取之雙成分PVT數據均用FOV (Flory-Orwoll-Vrij)與Schotte狀態方程式關聯，各系統之雙成分交互作用參數分別由雙成分之 PVT 數據擬合狀態方程式訂定。

In this study, we used a high-pressure vibrating tube densimeter
to measure the densities of solutions containing ionic liuqids at temperatures from 298.15 K to 348.15 K and pressures up to 50 MPa. The investigated mixtures included five binary systems containing two ionic liquid [DIPEA][C2COO]and [DIPEA][C7COO] and two oligomeric materials poly(ethylene glycol) (PEG200) and poly(propylene glycol) (PPG425) and water. The Tait equation and a semi-empirical model can correlate accurately the experimental density data over the entire pressure range.

The excess volumes were calculated from the experimental density
data. It was found that the excess volumes varied with composition in
an S shape for [DIPEA][C2COO] + water, [DIPEA][C2COO] + PEG200 and [DIPEA][C7COO] + PPG425. Over the entire composition range, the excess volumes are negative for [DIPEA][C7COO] + PEG200, and positive for[DIPEA][C2COO] + PPG425. The modified Redlich-Kister model represented well the excess volumes varying with composition at specific temperature and pressure.

The FOV (Flory-Orwoll-Vrij) and the Schotte equations of state
were also employed to correlate the PVT data. The binary interaction
parameter for each binary system was determined by fitting the binary
PVT data to the equations of state.

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